Pub Date : 1978-06-01DOI: 10.1109/ISEMC.1978.7566878
Kieth M. Kalanquin
T h i s p a p e r d i s c u s s e s t h e e f f e c t o f im pr ope r s h i e l d grou n d s on s h i e l d e d t w i s t e d p a i r w i r i n g when t h a t w i r in g i s used in a s i n g l e p o i n t c i r c u i t ground c o n f i g u r a t i o n . Low f r e q u e n c y m a g n e t i c f i e l d c o u p l i n g t o t h a t w i r e c i r c u i t c a n c a u s e a v o l t a g e g r a d i e n t t o e x i s t b e tween t h e w i r e and t h e s h i e l d . T h i s r e s u l t s i n a p o r t i o n o f t h e unwanted n o i s e v o l t a g e b e i n g p r e s e n t w i r e t o w i r e . The a c t u a l w i r e c o u p l i n g mechanism i s shown a l o n g w i t h t h e e q u i v a l e n t c i r c u i t s and t h e p a r a m e te r s need ed t o c a l c u l a t e t h e e f f e c t and make a good EMC j u d g ment.
{"title":"Shield Grounds on Shielded Twisted Pair Single Point Ground Circuits","authors":"Kieth M. Kalanquin","doi":"10.1109/ISEMC.1978.7566878","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566878","url":null,"abstract":"T h i s p a p e r d i s c u s s e s t h e e f f e c t o f im pr ope r s h i e l d grou n d s on s h i e l d e d t w i s t e d p a i r w i r i n g when t h a t w i r in g i s used in a s i n g l e p o i n t c i r c u i t ground c o n f i g u r a t i o n . Low f r e q u e n c y m a g n e t i c f i e l d c o u p l i n g t o t h a t w i r e c i r c u i t c a n c a u s e a v o l t a g e g r a d i e n t t o e x i s t b e tween t h e w i r e and t h e s h i e l d . T h i s r e s u l t s i n a p o r t i o n o f t h e unwanted n o i s e v o l t a g e b e i n g p r e s e n t w i r e t o w i r e . The a c t u a l w i r e c o u p l i n g mechanism i s shown a l o n g w i t h t h e e q u i v a l e n t c i r c u i t s and t h e p a r a m e te r s need ed t o c a l c u l a t e t h e e f f e c t and make a good EMC j u d g ment.","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128477330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1978-06-01DOI: 10.1109/ISEMC.1978.7566871
J. Rockway, S. T. Li, D. E. Baran, W. Kowalyshyn
This paper describes the development and the application o f the Design Communication Algorithm (DECAL) which is currently being used for the design and integration of shipboard exterior com munication systems. The DECAL program is interactive and easily allows the user to analyze design modifications while the program is executing.
本文介绍了设计通信算法(Design Communication Algorithm, DECAL)的发展及其应用，该算法目前正用于舰船外部通信系统的设计与集成。DECAL程序是交互式的，很容易让用户在程序执行时分析设计修改。
{"title":"Design Communication Algorithm (Decal)","authors":"J. Rockway, S. T. Li, D. E. Baran, W. Kowalyshyn","doi":"10.1109/ISEMC.1978.7566871","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566871","url":null,"abstract":"This paper describes the development and the application o f the Design Communication Algorithm (DECAL) which is currently being used for the design and integration of shipboard exterior com munication systems. The DECAL program is interactive and easily allows the user to analyze design modifications while the program is executing.","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128505371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1978-06-01DOI: 10.1109/ISEMC.1978.7566883
H. Martin
Many articles have been written and much work has been performed on the subject of man-made electri cal noise. Noise has been defined as "any inter ference or unwanted currents or voltage in an electri cal system or device".'This definition tends to be used by those who treat all received electrical energy as noise except for the desired signal. Most texts define noise as either thermal noise or impul sive noise. These texts 2,3,4 discuss the average power of thermal noise on a per unit bandwidth basis thereby assuming that the mean squared noise ampli tude is directly proportional to bandwidth. A few texts discuss the strength of impulsive noise assuming that the amplitude of impulsive noise is dir ectly proportional to bandwidth, (Reference 3). Military Standard 461, 462 and other government and industry standards utilize impulsive noise treatment of "noise amplitude directly proportional to band width" when measuring and reporting data in units of decibels relative to one microvolt per megahertz bandwidth. This noise amplitude relationship with bandwidth is simply expressed as, V 0 = kBx where v0 is the instantaneous voltage amplitude at the output of a circuit with 3 dB bandwidth B. When thermal noise is treated the exponent, x is equal to when impulsive noise is treated, x equals one, and k is the constant of proportionality.
{"title":"A Generalized Model of Man Made Electrical Noise","authors":"H. Martin","doi":"10.1109/ISEMC.1978.7566883","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566883","url":null,"abstract":"Many articles have been written and much work has been performed on the subject of man-made electri cal noise. Noise has been defined as \"any inter ference or unwanted currents or voltage in an electri cal system or device\".'This definition tends to be used by those who treat all received electrical energy as noise except for the desired signal. Most texts define noise as either thermal noise or impul sive noise. These texts 2,3,4 discuss the average power of thermal noise on a per unit bandwidth basis thereby assuming that the mean squared noise ampli tude is directly proportional to bandwidth. A few texts discuss the strength of impulsive noise assuming that the amplitude of impulsive noise is dir ectly proportional to bandwidth, (Reference 3). Military Standard 461, 462 and other government and industry standards utilize impulsive noise treatment of \"noise amplitude directly proportional to band width\" when measuring and reporting data in units of decibels relative to one microvolt per megahertz bandwidth. This noise amplitude relationship with bandwidth is simply expressed as, V 0 = kBx where v0 is the instantaneous voltage amplitude at the output of a circuit with 3 dB bandwidth B. When thermal noise is treated the exponent, x is equal to when impulsive noise is treated, x equals one, and k is the constant of proportionality.","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132788301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1978-06-01DOI: 10.1109/ISEMC.1978.7566868
B. M. Jenkins, J. A. Woody
{"title":"Cardiac Pacemaker Responses to Power Frequency Signals","authors":"B. M. Jenkins, J. A. Woody","doi":"10.1109/ISEMC.1978.7566868","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566868","url":null,"abstract":"","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116428680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1978-06-01DOI: 10.1109/ISEMC.1978.7566859
L. Scott, A. Agrawal, H. Fowles
The problem o f m u l t i c o n d u c t o r t r a n s m i s s i o n l i n e c h a r a c t e r i z a t i o n has b een a t o p i c o f i n t e r e s t f o r many y e a r s . P r e v i o u s work1 ' 2 p r o v i d e s meth ods o f t im e domain c h a r a c t e r i z a t i o n f o r m u l t i c o n d u c t o r t r a n s m i s s i o n l i n e s in homogeneous media w here a l l t h e p r o p a g a t i o n modes have t h e same v e l o c i t y . In g e n e r a l , f o r a m u l t i c o n d u c t o r l i n e (N c o n d u c t o r s p l u s a ground r e f e r e n c e ) in c r o s s s e c t i o n a l l y in homogeneous m e d i a , t h e r e w i l l be N p r o p a g a t i o n modes e a c h h a v i n g a d i f f e r e n t v e l o c i t y . A know ledge o f t h e modal v e l o c i t i e s and t h e modal am p l i t u d e s i s needed in o r d e r t o o b t a i n t h e p e r u n i t l e n g t h i n d u c t a n c e and c a p a c i t a n c e m a t r i c e s from t h e c h a r a c t e r i s t i c impedance m a t r i x 3 . The p r o p a g a t i o n modes f o r m u l t i c o n d u c t o r t r a n s m i s s i o n l i n e s w i t h i n homogeneous d i e l e c t r i c s a r e d i s c u s s e d i n r e f e r e n c e 4 .
在这一问题上，我们已经取得了一些进展。P r e v i o u s work1 ' 2 p r o v i d e s meth ods of im e domain c h a r a c t e r i z a t i o n f o r m u l t i c a t i o n s i n homogeneous media w where a l l t h e p r o p a i d modes have t h e s same v e l o c i t y .在均质介质中，如果有一个 m u l t i c a l c o n d u c t o r l i n e （N c o n d u c t o r s p l u s a ground r e f e r e n c e ），则会出现这样的情况、在同质的地层中，我们将采用 N 种模式和一种方法。在研究中需要对模态 V e l o c i t i e s 和模态 AM p l i t u d e s 有一定的了解，以便能更好地理解阻抗 m a t r i x 3 。与人类和自然界的阻抗模式 4 .
{"title":"Experimental Characterization of Multiconductor Transmission Lines in Inhomogeneous Media Using Frequency and Time Domain Techniques","authors":"L. Scott, A. Agrawal, H. Fowles","doi":"10.1109/ISEMC.1978.7566859","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566859","url":null,"abstract":"The problem o f m u l t i c o n d u c t o r t r a n s m i s s i o n l i n e c h a r a c t e r i z a t i o n has b een a t o p i c o f i n t e r e s t f o r many y e a r s . P r e v i o u s work1 ' 2 p r o v i d e s meth ods o f t im e domain c h a r a c t e r i z a t i o n f o r m u l t i c o n d u c t o r t r a n s m i s s i o n l i n e s in homogeneous media w here a l l t h e p r o p a g a t i o n modes have t h e same v e l o c i t y . In g e n e r a l , f o r a m u l t i c o n d u c t o r l i n e (N c o n d u c t o r s p l u s a ground r e f e r e n c e ) in c r o s s s e c t i o n a l l y in homogeneous m e d i a , t h e r e w i l l be N p r o p a g a t i o n modes e a c h h a v i n g a d i f f e r e n t v e l o c i t y . A know ledge o f t h e modal v e l o c i t i e s and t h e modal am p l i t u d e s i s needed in o r d e r t o o b t a i n t h e p e r u n i t l e n g t h i n d u c t a n c e and c a p a c i t a n c e m a t r i c e s from t h e c h a r a c t e r i s t i c impedance m a t r i x 3 . The p r o p a g a t i o n modes f o r m u l t i c o n d u c t o r t r a n s m i s s i o n l i n e s w i t h i n homogeneous d i e l e c t r i c s a r e d i s c u s s e d i n r e f e r e n c e 4 .","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127502914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1978-06-01DOI: 10.1109/ISEMC.1978.7566886
R. Spiegel, D. E. Kerns, E. Bronaugh
A cavity system capable of producing independent electric and magnetic fields by the simultaneous excitation of two indepen dent cavity modes has been built and tested. The cavity length was made adjustable by a novel mechanical design which allowed an end plate to be accurately positioned at the desired length. The adjustable length provided the flexibility to selectively excite higher order cavity modes without building a new cavity for each mode. In addition, a mechanical design is set forth for a cavity whose cross sectional dimensions as well as length can be varied. space. This can present interference problems and radiation hazards. High strength electromagnetic fields above around 50 MHz can potentially couple very strongly to objects the size of humans;4,5 this could be hazardous to laboratory personnel. Considering the above, it is felt that a different approach to simulating complex electromagnetic fields is needed. The analysis presented in this paper indicates that a resonant cavity system is feasible. A resonant cavity system can provide (1) a very efficient conversion of source power to high intensity fields, and (2) in dependent electric and magnetic fields by the simultaneous excita tion o f two independent cavity modes. Other major advantages o f a cavity system are:
{"title":"Development of a Dual Mode, Variable Volume Resonant Cavity System","authors":"R. Spiegel, D. E. Kerns, E. Bronaugh","doi":"10.1109/ISEMC.1978.7566886","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566886","url":null,"abstract":"A cavity system capable of producing independent electric and magnetic fields by the simultaneous excitation of two indepen dent cavity modes has been built and tested. The cavity length was made adjustable by a novel mechanical design which allowed an end plate to be accurately positioned at the desired length. The adjustable length provided the flexibility to selectively excite higher order cavity modes without building a new cavity for each mode. In addition, a mechanical design is set forth for a cavity whose cross sectional dimensions as well as length can be varied. space. This can present interference problems and radiation hazards. High strength electromagnetic fields above around 50 MHz can potentially couple very strongly to objects the size of humans;4,5 this could be hazardous to laboratory personnel. Considering the above, it is felt that a different approach to simulating complex electromagnetic fields is needed. The analysis presented in this paper indicates that a resonant cavity system is feasible. A resonant cavity system can provide (1) a very efficient conversion of source power to high intensity fields, and (2) in dependent electric and magnetic fields by the simultaneous excita tion o f two independent cavity modes. Other major advantages o f a cavity system are:","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"139 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124501375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1978-06-01DOI: 10.1109/ISEMC.1978.7566839
John A. Malack
{"title":"Television Receiver Susceptibility to Broadband Noise","authors":"John A. Malack","doi":"10.1109/ISEMC.1978.7566839","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566839","url":null,"abstract":"","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131915763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1978-06-01DOI: 10.1109/ISEMC.1978.7566844
J. L. Bean, Richard A. Hall
Within the electromagnetic compatibility community it is recognized that there is a need for better methods to measure the radiat1 2 3 ed susceptibility of electronic systems. ' ' Free-space measurement facilities are economi cally unattractive, and the usual recourse is to conduct susceptibility tests within shielded rooms. Shielded room data are not, however, solely indicative of the test specimen characteristics; such data are influenced by room characteristics such as size, shape, and loss as well as location of the specimen and associated test equip ment within the room. It is easy, however, to convert any standard shielded room into a "mode-stirred" chamber wherein radiated susceptibility tests can be performed with results that are accurate, repeatable, and independent of test set-up. The problem of relating free-space and mode-stirred environ ments is approached in two ways, with the end result being a calibration graph that relates chamber input power to equivalent plane wave power density inside the chamber. The accuracy of mode-stirred chamber data is demonstrated by comparing susceptibility profiles from both free-space and modestirred test environments.
{"title":"Electromagnetic Susceptibility Measurements Using a Mode-Stirred Chamber","authors":"J. L. Bean, Richard A. Hall","doi":"10.1109/ISEMC.1978.7566844","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566844","url":null,"abstract":"Within the electromagnetic compatibility community it is recognized that there is a need for better methods to measure the radiat1 2 3 ed susceptibility of electronic systems. ' ' Free-space measurement facilities are economi cally unattractive, and the usual recourse is to conduct susceptibility tests within shielded rooms. Shielded room data are not, however, solely indicative of the test specimen characteristics; such data are influenced by room characteristics such as size, shape, and loss as well as location of the specimen and associated test equip ment within the room. It is easy, however, to convert any standard shielded room into a \"mode-stirred\" chamber wherein radiated susceptibility tests can be performed with results that are accurate, repeatable, and independent of test set-up. The problem of relating free-space and mode-stirred environ ments is approached in two ways, with the end result being a calibration graph that relates chamber input power to equivalent plane wave power density inside the chamber. The accuracy of mode-stirred chamber data is demonstrated by comparing susceptibility profiles from both free-space and modestirred test environments.","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131871702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1978-06-01DOI: 10.1109/ISEMC.1978.7566858
F. Tesche, S. Chang, T. Liu
{"title":"Application of Multiconductor Transmission Line Theory for EMP Analysis: Numerical and Experimental Results","authors":"F. Tesche, S. Chang, T. Liu","doi":"10.1109/ISEMC.1978.7566858","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566858","url":null,"abstract":"","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127548543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1978-06-01DOI: 10.1109/ISEMC.1978.7566843
E. Bronaugh, D. R. Kerns
An o p t i c a l l y i s o l a t e d a n t e n n a sy s tem was d e v e lo p e d f o r u se i n s h i e l d e d e n c l o s u r e s t c p r o v i d e mea surement o f e l e c t r i c f i e l d e m i s s io n l e v e l s w i t h i n +3 dB o f t h e i r open a r e a v a l u e s . The uncompensated sy s te m r e s p o n s e to f r e q u e n c i e s be tween 20 MHz and 500 MHz i s f l a t w i t h s u f f i c i e n t s e n s i t i v i t y f o r narrowband and broadband measurem ents t o MIL-STD-461A r a d i a t e d l i m i t s . I n t r o d u c t i o n R e l i a b l e measu remen ts o f e l e c t r o m a g n e t i c f i e l d s t r e n g t h f o r e l e c t r o m a g n e t i c c o m p a t i b i l i t y (EMC) t e s t in g a r e d i f f i c u l t t o a c h i e v e . E l e c t r o m a g n e t i c f i e l d s t r e n g t h measurem ents a r e made w i t h i n s h i e l d e d e n c l o s u r e s o r i n open a r e a t e s t s i t e s . I d e a l l y , t h e mea su re m en t s o f f i e l d s t r e n g t h made in s h i e l d e d e n c l o s u r e s s h o u l d c o r r e l a t e w i t h t h o s e made in open a r e a s . E l e c t r o m a g n e t i c measurem ents f o r EMC a r e n o r m a l ly pe rform ed w i t h i n s h i e l d e d e n c l o s u r e s t o keep u n d e s i r e d i n t e r f e r i n g s i g n a l s f rom b e ing i n t r o d u c e d i n t o t h e mea s u r i n g eq u ipmen t when making r a d i a t e d e m i s s i o n s mea s u r e m e n t s . A d e s i r a b l e f e a t u r e o f such f i e l d s t r e n g t h mea surement s i s t h a t t h e y may be c o r r e l a t e d w i t h s i m i l a r measurem ents i n open a r e a s . Such c o r r e l a t i o n can r e a d i l y be o b t a i n e d in t h e f r e q u e n c y r a n g e below a b o u t 1 2 20 MHz. ’ Above t h i s f r e q u e n c y , s t a n d i n g waves w i t h i n t h e e n c l o s u r e n o r m a l l y p r e v e n t c o r r e l a t i o n w i th i 3 a q is 7 p. q open a r e a m easu rem en t s . ’ ’ ’ ’ ’ ’ ’ T h i s u n d e s i r a b l e s i t u a t i o n has g e n e r a l l y been overcome in t h e f r e q u e n c y r a n g e above 200 MHz by u s in g RF a b s o r b i n g m a t e r i a l a n d / o r hooded a n t e n n a s which a r e c a p a b l e o f r e d u c i n g unwanted r e f ^ e c t i o n s . ' ' ' , '*' ,̂ ''''*', ^ , ^ , 14 Background o f Problem The pr obl ems t h a t a r e f r e q u e n t l y e n c o u n t e r e d d e pend on which o f t h e two c l a s s e s o f measu remen t t e c h n i q u e s a r e u se d . For measu remen ts made in s h i e l d e d e n c l o s u r e s , i n t e r a c t i o n s amongst t h e e qu ipm en t un de r t e s t (EUT), s h i e l d e d e n c l o s u r e , and measu remen t a n t e n na a r e most f r e q u e n t and s e v e r e , w h i l e f o r m ea su re ments made in open a r e a s i t e s , amb ie n t n o i s e , EMI m e t e r s e n s i t i v i t y and p r o c e d u r a l problems a r e most f r e q u e n t . S h i e l
{"title":"A New Isolated Antenna System for Electromagnetic Emissions Measurements in Shielded Enclosures","authors":"E. Bronaugh, D. R. Kerns","doi":"10.1109/ISEMC.1978.7566843","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566843","url":null,"abstract":"An o p t i c a l l y i s o l a t e d a n t e n n a sy s tem was d e v e lo p e d f o r u se i n s h i e l d e d e n c l o s u r e s t c p r o v i d e mea surement o f e l e c t r i c f i e l d e m i s s io n l e v e l s w i t h i n +3 dB o f t h e i r open a r e a v a l u e s . The uncompensated sy s te m r e s p o n s e to f r e q u e n c i e s be tween 20 MHz and 500 MHz i s f l a t w i t h s u f f i c i e n t s e n s i t i v i t y f o r narrowband and broadband measurem ents t o MIL-STD-461A r a d i a t e d l i m i t s . I n t r o d u c t i o n R e l i a b l e measu remen ts o f e l e c t r o m a g n e t i c f i e l d s t r e n g t h f o r e l e c t r o m a g n e t i c c o m p a t i b i l i t y (EMC) t e s t in g a r e d i f f i c u l t t o a c h i e v e . E l e c t r o m a g n e t i c f i e l d s t r e n g t h measurem ents a r e made w i t h i n s h i e l d e d e n c l o s u r e s o r i n open a r e a t e s t s i t e s . I d e a l l y , t h e mea su re m en t s o f f i e l d s t r e n g t h made in s h i e l d e d e n c l o s u r e s s h o u l d c o r r e l a t e w i t h t h o s e made in open a r e a s . E l e c t r o m a g n e t i c measurem ents f o r EMC a r e n o r m a l ly pe rform ed w i t h i n s h i e l d e d e n c l o s u r e s t o keep u n d e s i r e d i n t e r f e r i n g s i g n a l s f rom b e ing i n t r o d u c e d i n t o t h e mea s u r i n g eq u ipmen t when making r a d i a t e d e m i s s i o n s mea s u r e m e n t s . A d e s i r a b l e f e a t u r e o f such f i e l d s t r e n g t h mea surement s i s t h a t t h e y may be c o r r e l a t e d w i t h s i m i l a r measurem ents i n open a r e a s . Such c o r r e l a t i o n can r e a d i l y be o b t a i n e d in t h e f r e q u e n c y r a n g e below a b o u t 1 2 20 MHz. ’ Above t h i s f r e q u e n c y , s t a n d i n g waves w i t h i n t h e e n c l o s u r e n o r m a l l y p r e v e n t c o r r e l a t i o n w i th i 3 a q is 7 p. q open a r e a m easu rem en t s . ’ ’ ’ ’ ’ ’ ’ T h i s u n d e s i r a b l e s i t u a t i o n has g e n e r a l l y been overcome in t h e f r e q u e n c y r a n g e above 200 MHz by u s in g RF a b s o r b i n g m a t e r i a l a n d / o r hooded a n t e n n a s which a r e c a p a b l e o f r e d u c i n g unwanted r e f ^ e c t i o n s . ' ' ' , '*' ,̂ ''''*', ^ , ^ , 14 Background o f Problem The pr obl ems t h a t a r e f r e q u e n t l y e n c o u n t e r e d d e pend on which o f t h e two c l a s s e s o f measu remen t t e c h n i q u e s a r e u se d . For measu remen ts made in s h i e l d e d e n c l o s u r e s , i n t e r a c t i o n s amongst t h e e qu ipm en t un de r t e s t (EUT), s h i e l d e d e n c l o s u r e , and measu remen t a n t e n na a r e most f r e q u e n t and s e v e r e , w h i l e f o r m ea su re ments made in open a r e a s i t e s , amb ie n t n o i s e , EMI m e t e r s e n s i t i v i t y and p r o c e d u r a l problems a r e most f r e q u e n t . S h i e l","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115808976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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